Question

I’ve two tables as User and User_activity and the structure of them are,

User

id 
name
email
etc..

user_activity

id,
initiator_id,
source_id,
target_id,
activity_code,
activity

Here i want to select all the activity list for a user (i can refer them to source_id) with all names of initiator, source, target..

How to get that?

Answer 1

You simply join three times, using aliases for each f the three times you reference User…

SELECT
  user_activity.*,
  Initiator.Name   AS InitiatorName,
  Source.Name      AS SourceName,
  Target.Name      AS TargetName
FROM
  user_activity
INNER JOIN
  user             AS Initiator
    ON Initiator.ID = user_activity.initiator_id
INNER JOIN
  user             AS Source
    ON Source.ID    = user_activity.source_id
INNER JOIN
  user             AS Target
    ON Target.ID    = user_activity.target_id